/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.skatiger.jrove.compiler;

import java.io.IOException;

import javax.el.ELContext;
import javax.el.ELException;
import javax.el.ExpressionFactory;

import org.skatiger.jrove.JroveException;
import org.skatiger.jrove.ResponseWriter;
import org.skatiger.jrove.ViewContext;
import org.skatiger.jrove.el.ELText;

final class TextInstruction implements Instruction {
    private final ELText txt;

    private final String alias;

    public TextInstruction(String alias, ELText txt) {
        this.alias = alias;
        this.txt = txt;
    }

    public Instruction apply(ExpressionFactory factory, ELContext ctx) {
        ELText nt = null;
        try {
            nt = this.txt.apply(factory, ctx);
        } catch (Exception e) {
            throw new JroveException("parser alias" + alias + " text "
                    + this.txt.toString() + " exception", e);
        }
        if (nt == this.txt) {
            return this;
        }
        return new TextInstruction(alias, nt);
    }

    public boolean isLiteral() {
        return txt.isLiteral();
    }

    public void write(ViewContext context) throws IOException {
        ResponseWriter out = context.getResponseWriter();
        try {
            ELContext elContext = context.getELContext();
            txt.writeText(out, elContext);
            //out.writeText(txt.toString(elContext), null);
        } catch (ELException e) {
            throw new ELException(this.alias + ": " + txt.toString()+" "
                    + e.getMessage(), e.getCause());
        } catch (Exception e) {
            throw new ELException(this.alias + ": "+ txt.toString()+" " + e.getMessage(), e);
        }
    }
}
